I just know that when I woke up, I didn't feel real. Part of it may be because I just started reading House of Leaves (Joey, if you're reading this, it's only because I finished the sample of the Languages book), I had gotten through the introduction, which was pretty creepy.
On top of that, my arm was asleep. So the first few minutes of waking up, I felt like I didn't exist. It was like what a robot that just gained self-awareness may feel like. Creepy.